Machinist&#39;s work clamp



July 1o, 1928.

A. SCHMALZ MAGHINISTS WORK `amm? v Filed Jan. 12, 1927 Patented July .'10, A19.28. l'

i `invention relate s toifa Well-known type V-of machinists worlrclamp'jwhrch, gen- "erallydescribed, comprises a slotted 'or aperof' -aecidental rnisplacement o`r losslof T4 saddle'menr'iber'; Vand another object'fis to plo.-

- vide a' fworlf clamp" of the type) mentioned 1 timarring or defacing `the 'top K orfthe Work which niayf-` be'V *safelyv used Without@y danger table; v

tailed description, taken inconnectien with nthe accompanying drawing, wherein I have illustrated a simple and practical.: embo,dip inentfof V the invention, vand 1n whichl Fig. vl. isan elevation vof my improved jo; work clamp, with the clamp lbar in central vertical longitudinal section, showing in full and dotted lines respectively two work-engaging positions thereof; v 35'" Fig.' 2 is a Verticaltransverse section,'on the line'2-2'of Fig. 1,;

Fig. 3'is a top plan of the lclamp bar, viewf jng the latter a substantially hporlzontal position ',Fig. 4 isan enlarged.- horizontal section throughthe saddle member, bolt, a'ndlockv ing sleeve', on-the line 4 4 of F1rg .-2;l '.1 i. Fig. 5 is a perspectiveelevation lofthe "'plockingsleeve. g w 'y In the drawing T'represents a sect1on 'ofVV- v Y the Work supporting table of a Adrill press `or other machine, or a machinists work bench,

such Vtables and lbenches being commonly k formed 'with` T-slots S therein to accommodate in a sliding manner the head andshank of 'a bolt B through lwhich -a clamp bar' is' #pressed into; holding engagement; `with a otherwise operated on. designates the clamp piece'of work W to vbe drilled, planed, yor

' ,erably consists offa flat straight/bar of steel amsans@'erbaceeeines objects attendant advantag'es f f'f the invention lwilll be apparent.V to persons i g5' skilled in the artfrom the followingA de? or uniformi depth and 'widthlpfovided-Q it 4one endthereolf `with anintegraldownwarddlv' *and forwardly' 4inclined work-engaging lockingE sleeve (hereinafter described). f en- Ycircling?fthe-1y saine," "may slide'fl'freely' *there- I 1Jthrough; Ingtlielupper side edgescfthe slot I l2 are formed v'aplnrality vef contiguousgcon;

ward end being'vpreierably formed continu'- `"o'1f`i-,wvi thf a' seat'v 1646i, like characterv 'formed 1n the'- upper forwardfend edge offtheslet,

-#andthes'e'ats lf3' at the rear endbeing preferf ably extended (over the upper rear .end- 'edge of Vthe slot,vk 'as 'sh'ovviigat 17.' annular fsaddleimember 1 8 'that'has ,aloose' sliding "fit-on the bolt'B'is'formedfwithaflat'upper side 219' 2anda-1 f transversely rounded l'or con-* :Vex flower? side4 20 of's'e'ginentali spherical form thathas a universal swivel :t von the.

seats `landl 16, or the seatsflil, or th'ejseats;`

713 and 175' according to the )position of the.,V

bolt in the slot. A nut 21011 thelupper'yend ,of VtheboltBfwbenscrewed down-0n the i?k latter, causesI the nosek 11 of the bar' to secure-V wide grip on .the workjwhere the engaged 'surface 'of the latter may `not be ,perfectly level, while thesaddle attheV Sametime may i i .alwaysfadjust itself in any, direction to a full bearing on its seat without any. side thrust onfthe bolt under eithery endwise or sidevv'is'e; ltilting or canting of the clampgban WA washer 22'is preferably interposed.A betweenVVV v f the 'nut andthe saddleV member to prevent B5 .i f f ly clamp -thegwork on the table; and owing-2Q" I f tol the `universal swivelt of the vsaddle on.' V' any of the several'seats,. thebar, when under 5 pressure, is free to yadjust itselflto afrm` Vthe turningof the latter on its" seatduring the iinal compressive turning movements of 'the nut.' By making thev concave `saddleseats contiguous to eachother, vit is possible A l to provide fon a slot of given lengthA a -maxiniuin numberv of such seats capable of coe voperating with av saddle having; a seat-enf'Y 105 gagingportion adapted to the seats, thereby adjustment Capacity'.l

I n a tool of this character fit desir'aliileV Y A 151e.l loss or lInis'pl'acement of the saddle niembenf. .y '"anditliisf accomplish by a simple to vprinride `means for preventing accidental combining compactnessl ofsize with a large inayv be obtained j by making the external diameter ofthe. sleevelslightly larger than the diameter ofl thelbore of the saddle and `splitting the upper end of the sleeve as shown at 24.), and at its lower end formed `with an annular flange or bead `jof greater m ydiameter than the widthfof the slot 12. APref- .erably the sleeve is" permanently united `to the saddle by swagingts upper end intoa countersinkV in the bore of the saddle, as shown at .26 in Fig. .2. y

f In Vthe use of tools of this character the surface ofthe table or bench is frequently dented, scratched and otherwise marredy by fthe heel ofthe clamp bar under the heavy ypressure applied to the latter. Another feature of my invention, which is designed to obviate this objectionable action of thetool, Y consists of a block or pad 27 of soft material,

i Vrelatively toV that of the table or bench, that -isattachech as by countersnnk rivets 28, vto `and crosswise of the lower side of the heel' of ,tlie bar so Vas to rest` directly on the table in its upfper edge, a-saddle member shaped said slot servingt'o retain said saddle menior. bench. This pad, which may be of fibre,

lead, or other like soft material, transmits the pres-sure without denting or otherwise defaci'ng the surface on which it rests.

I claim- Y f l.' A machinists work clamp, comprising a bar formed with a. longitudinal vertical slot therein, said'slot having a plurality of seats to `fit an swivel in said seats, a clamp bolt ,extendingthrough said slot and saddle, a nut .en theupper end ofy said' bolt, and means secured to said saddle member and locked in ber engaged with said bar when said bolt is withdrawn.

1 2.', A A machinists work clamp, comprising ,a bar formednwith a longitudinal verticalv slot thereimfsaid slot* having a plurality of seats in its( upper edge, a 4saddle*member shaped to lit and swivel in said'k seats, a clamp bolt extending through said Vslot and 4Vsaddle', a nuton the upper end off-said bolt,

and means for locking said saddle'member greater diameter' .than the vvyid-,hf-O.....Sldr y S1946:

u ALBANO SCHMMZ.,

to said `bar comprising 'sleev'e attachedmiat its upper end to said saddle,V member, eX- ltending through said 4slot around'saidbolt, and formed with a flanged lowcr'end of., 

